Large Loop Antenna for MW reception, Teminated/Unterminated

[MavamQ]

Hi all,
I'm interested in MW and LW reception.
I want to install a large loop 70ft long x 21ft? tall. I'm looking at this loop page and it has 50ft and 80ft and more lengths.
The SuperLoop: A super-sized terminated corner-fed broadband loop. Picture posted if you don't want to go to the link.
I want to get the proper dimensions for the largest Null. But I don't see how to extrapolate the proper height from the numbers.
I suspect is is between 3.3 and 4. Any thoughts?
Also, in my searches, I don't find any info on how high to have the bottom wire from the ground.
Thanks for your thoughts.

P.S I want to make it 70ft, because later I have another antenna that requires 70ft spacing of my support poles.
I only want to build the supporting structures once.
If there is a better forum for MW antenna question?

Not sure why my picture didn't post.



I had a Flag antenna years ago and it was up 14 ft, I'm now thinking with a loop antenna
like this, higher of the ground is better.

 

[Dirk_SDR]

Not directly an answer to your question,- but are you up to build a SULA:

Introducing the amazing SULA: An affordable unidirectional DX-grade loop antenna that you can build!

Many thanks to SWLing Post contributor extraordinaire, 13dka, who brings us a three part series about the new SULA homebrew antenna project. This first article describes this affordable antenna and…

swling.com

...?
If yes, it should be turnable, because you possibly don't get many AM stations in the direction of the termination resistor (= null). Or: how do you manage to turn such a large antenna?

 

[MavamQ]

I have seen that build, I have also had a rotatable variable Termination Flag antenna.
The SULA has a -85DBI in the MW band and even lower in the LW band.
I want to experiment with a shorted termination resistoon the 70ft loop to see if I can get a couple of stations
1000+ miles away that I have only had seconds of. The gain is 30db higher with the resistor shorted.
I don't plan to rotate the 70ft loop, I'm on the Gulf coast and mostly want to null lightning
storm static coming from the South.
Thanks for being the first to respond.
Mikek

 

[13dka]

The SULA only comes somewhat to life around 1MHz, above 1MHz it's quickly getting better and good enough for some light TA DX with the null helping a lot. But still, it's not an antenna I'd want to use for serious MW DX.

 

[Dirk_SDR]

SULA only stands for an antenna principle.
I don't know enough about these antennas.
These forums could perhaps be helpful:

loopantennas groups.io Group

*This is the Loop Antenna Group to Ask Your Questions, Get Answers and Information about Loop Antennas for improved your Radio Listening and Enjoyment.* This is your "HOW TO" Loop Antenna Forum to : Get Information, Plan, Design and Build Loop Antennas for both Radio Reception and Transmission...

groups.io

CapeDX groups.io Group

The purpose of this Group is to share information with regard to the hobby of long distance radio reception (DX). This Group is primarily (but not limited to) DXers who either live on or have some connection to Cape Cod, Massachusetts, USA. The Group is primarily for Medium Wave DX (530 -...

groups.io

 

[ka3jjz]

You can also learn a bit about the Small Unidirectional Loop Array (SULA) from the construction notes found here...

Loops - The RadioReference Wiki

wiki.radioreference.com

Mike